You can also just run it directly from the command line, no configuration needed:

redshift -l manual -l "52.05:-1.05" -t 5000:1100

This sets the position to manual (instead of using geoclue), and use the coordinates to set the latitude (north-south) to 52.05, and the longitude (east-west) to -1.05. You can find your position (though, a position nearby will do) manually using Google Maps, or similar: